And it shall be upon Aaron’s forehead, that Aaron may bear the iniquity of the holy things, which the children of Israel shall hallow in all their holy gifts; and it shall be always upon his forehead, that they may be accepted before the LORD.
The verse says that a symbol should be placed on Aaron's forehead. This will help him carry the mistakes made with sacred items given by the people of Israel during their special offerings. The symbol will always stay on his forehead so that their offerings are accepted by God.